were frightened
奇怪声响再次发生，几个仆人被押送到黑漆漆的厨房里，但是当所有仆人回来后，都被吓死。
all returned were frightened to death
frighten to death 吓死 固定搭配
all 指的是 all the servants 代词嘛！
all returned 是省略句 = all the servants [ who returned from the kitchen ] were frightened to death
frightened
After the strange noise had been heard again,several more servants were sent to the dark kitchen, but all returned__frightened______ (frighten) to death.
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